V2x communication device and data communication method therefor

ABSTRACT

Disclosed is a method for communicating data of a V2X communication apparatus. The method for communicating data of a V2X communication apparatus according to an embodiment of the present invention includes receiving service advertisement information for announcing a service; and receiving service data based on the service advertisement information, the service advertisement information includes at least one of a header and a service information segment or a channel information segment.

TECHNICAL FIELD

The present invention relates to a method and apparatus for V2Xcommunication, and more particularly, relates to a data communicationmethod for receiving service advertisement information a data servicebased on the service advertisement information.

BACKGROUND ART

In recent years, a vehicle has become a result of complex industrialtechnology, which is a fusion of electric, electronic, and communicationtechnologies, centering on mechanical engineering and the vehicle isalso called a smart car in such an aspect. A smart car has beenproviding various customized mobile services as well as traditionalvehicle technology such as traffic safety/complicatedness by connectingdrivers, vehicles, and transportation infrastructures. The connectivitymay be implemented using vehicle to everything (V2X) communicationtechnology. The system that provides the connectivity may be referred toas a connected vehicle system.

DISCLOSURE Technical Problem

As the connectivity of vehicles become enforced and increased, theamounts and types of services targeted to V2X communication becomeincreased. As the mount of service data exchanged by V2X communicationincreases, it is a method for distinguishing the service data in detail.In addition, it is required a method transmitting and receiving serviceadvertisement information that may provide non-real time services.

Technical Solution

In order to solve the technical problem, a method for communicating dataof a V2X communication apparatus according to an embodiment of thepresent invention includes receiving service advertisement informationfor announcing a service; and receiving service data based on theservice advertisement information, the service advertisement informationincludes at least one of a header and a service information segment or achannel information segment, the header includes option indicatorinformation indicating whether at least one of the service informationsegment or the channel information segment, the service informationsegment provides information related to the service, the channelinformation segment provides information related to a channel throughwhich the service is provided, and the service information segmentincludes provider service ID (PSID) information identifying anapplication area and sub-provider service ID (SPSID) informationidentifying a service included in the application area.

According to the method for communicating data by a V2X communicationapparatus according to an embodiment of the present invention, theservice information segment may further include service countinformation representing the number of services identified by the SPSIDinformation.

In addition, according to the method for communicating data by a V2Xcommunication apparatus according to an embodiment of the presentinvention, the service advertisement information may further includecompression information indicating at least one of whether to compressthe service advertisement information or a compression type.

In addition, according to the method for communicating data by a V2Xcommunication apparatus according to an embodiment of the presentinvention, the service advertisement information may further includereserved time information for non-real time service access.

In addition, according to the method for communicating data by a V2Xcommunication apparatus according to an embodiment of the presentinvention, the method may further include filtering desired service databased on the PSID information and the SPSID information; and processingthe filtered desired service data.

In addition, according to the method for communicating data by a V2Xcommunication apparatus according to an embodiment of the presentinvention, the service advertisement information may further includeService Specific Permission (SSP) information representing whether toallow a transmission for the service.

In order to solve the technical problem, a V2X communication apparatusaccording to an embodiment of the present invention includes a memoryconfigured to store data; an RF unit configured to transmit and receivea radio signal; and a processor configured to control the RF unit,wherein the V2X communication apparatus is configured to: receiveservice advertisement information for announcing a service; and receiveservice data based on the service advertisement information, the serviceadvertisement information includes at least one of a header and aservice information segment or a channel information segment, the headerincludes option indicator information indicating whether at least one ofthe service information segment or the channel information segment, theservice information segment provides information related to the service,the channel information segment provides information related to achannel through which the service is provided, and the serviceinformation segment includes provider service ID (PSID) informationidentifying an application area and sub-provider service ID (SPSID)information identifying a service included in the application area.

Technical Effects

According to the present invention, a service advertisement centering onapplication-service ID is used additionally in addition to the datadistribution scheme in a unit of application class/area, an efficientmessage communication may be provided. Particularly, even in thecongestion situation in which an amount of message is concentrated, anefficient message communication and a service in accordance withcharacteristic/situation of a user may be provided. The presentinvention may provide a data communication method to which variouscommunication techniques may be flexibly applied.

The other effect of the present invention will be described in thefollowing specification.

DESCRIPTION OF DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the present invention and are incorporated in andconstitute a part of this application, illustrate embodiments of thepresent invention together with the detailed description serving todescribe the principle of the present invention.

FIG. 1 illustrates a protocol stack of a connected vehicle systemaccording to an embodiment of the present invention.

FIG. 2 illustrates a communication between V2X communication apparatusesaccording to an embodiment of the present invention.

FIG. 3 illustrates a V2X communication method according to an embodimentof the present invention.

FIG. 4 illustrates a V2X communication method of a V2X apparatusaccording to an embodiment of the present invention.

FIG. 5 illustrates a V2X communication method of a V2X apparatusaccording to another embodiment of the present invention.

FIG. 6 illustrates a V2X communication method of a V2X communicationapparatus according to another embodiment of the present invention.

FIG. 7 illustrates a format of WAVE Service Advertisement (WSA)information according to an embodiment of the present invention.

FIG. 8 illustrates a service information segment of WAVE ServiceAdvertisement (WSA) according to an embodiment of the present invention.

FIG. 9 illustrates a channel information segment of WAVE ServiceAdvertisement (WSA) according to an embodiment of the present invention.

FIG. 10 illustrates a channel information segment of WSA according to anembodiment of the present invention.

FIG. 11 illustrates Service Advertisement Message (SAM) format accordingto an embodiment of the present invention.

FIG. 12 illustrates a method for transmitting Service SpecificPermission according to an embodiment of the present invention.

FIG. 13 illustrates a method for indicating a compression according toan embodiment of the present invention.

FIG. 14 illustrates service advertisement information that supportsnon-real time service based on an application class or anapplication-service.

FIG. 15 illustrates additional content of a provider service requesttable for the application-service for the MIB according to an embodimentof the present invention.

FIG. 16 illustrates additional content of a user service request tablefor the application-service for the MIB according to an embodiment ofthe present invention.

FIG. 17 illustrates additional content of a reserved time for non-realtime service to the MIB according to an embodiment of the presentinvention.

FIG. 18 illustrates a method for receiving a hybrid service of a V2Xcommunication apparatus according to an embodiment of the presentinvention.

FIG. 19 illustrates a method for receiving a non-real time service of aV2X communication apparatus according to an embodiment of the presentinvention.

FIG. 20 illustrates a block diagram of a V2X communication apparatusaccording to an embodiment of the present invention.

FIG. 21 is a flowchart illustrating a data communication method of a V2Xcommunication apparatus according to an embodiment of the presentinvention.

BEST MODE FOR INVENTION

Preferred embodiments of the present invention are described in detailand examples thereof are illustrated in the accompanying drawings. Thefollowing detailed description with reference to the accompanyingdrawings is intended to illustrate the preferred embodiments of thepresent invention rather than merely illustrating embodiments that maybe implemented according to embodiments of the present invention. Thefollowing detailed description includes details to provide a thoroughunderstanding of the present invention, but the present invention doesnot require all these details. In the present invention, respectiveembodiments described below need not be particularly used separately.Multiple embodiments or all embodiments may be together used, andspecific embodiments may be used as a combination.

Most of the terms used in the present invention are selected from thegeneral ones that are widely used in the field, but some terms arearbitrarily selected by the applicant and the meaning thereof will bedescribed in detail in the following description as necessary.Accordingly, the invention should be understood based on the intendedmeaning of the term rather than the mere name or meaning of the term.

The present invention relates to a V2X communication apparatus and theV2X communication apparatus is included in an Intelligent TransportSystem (ITS) to perform all or some functions of the ITS. The V2Xcommunication apparatus may communicate with vehicles and vehicles,vehicles and infrastructure, vehicles and bicycles, and mobile devices.The V2X communication apparatus may be abbreviated as a V2X apparatus.As an embodiment, the V2X apparatus may correspond to an on board unit(OBU) of the vehicle or may be included in the OBU. The V2X apparatusmay correspond to a road side unit (RSU) of the infrastructure or may beincluded in the RSU. Alternatively, the V2X communication apparatus maycorrespond to an ITS station or may be included in the ITS station. Asan embodiment, the V2X apparatus may operate in Wireless Access InVehicular Environments (WAVE) system of IEEE 1609.1 to 4.

A connected vehicle system defines V2X communication protocol forcommunication with a vehicle and all types of other devices included inthe vehicle. The safety use case for Vehicle to Vehicle (V2V)communication, Vehicle to Infrastructure (V2I) communication andInfrastructure to Vehicle (I2V) communication is defined first, and theprovided services are extended gradually. The service announcementtechnology for providing services is implemented as WAVE ServiceAdvertisement (WSA) message and Service Announce Message (SAM) inAmerica and Europe, respectively. That is, when a transmitter at aprovider transmits messages, a receiver at a user may use serviceannouncement information and may filter only desired services among thereceived messages. The receiver may filter the desired message andperform appropriate application by analyzing data of the receivedmessages.

As an embodiment, a data distribution may be performed in a unit ofapplication class. As the safety application concentrated use casesbecomes more diversified and the amount of data to process increases,the data distribution scheme in a unit of application class haslimitation in efficiency and performance. In addition, a detailedcontrol is difficult for each of various application services in theapplication class. For example, even in the case that attributes such asa priority and a permission are provided for each application-service, areceiver is unable to filter these, a use method of data is veryrestrictive. In addition, each of the application services in a specificapplication area is unable to be communicated with differentcommunication methods in a separate time, it is difficult to provide aplurality of services flexibly and efficiently. In the presentdisclosure, the service provided by a service provide may be referred toas a service or an application service.

Accordingly, hereinafter, it is described a method for announcing aservice in a unit of application service and transmitting the serviceannouncement. The service related information that announces a servicemay be referred to as a service advertisement, service advertisementinformation or service announcement information.

Hereinafter, the present invention provides a service type forsupporting an application service centric method as well as theapplication class centric data distribution method. Further, the presentinvention provides an encapsulation method of a single format withoutregard to the service expression method.

The present invention provides a method for providing more detailedfiltering by using information such as SPSID (SubPSID) and priority in aunit of application-service, and permission as well as filtering in aunit of application class/area through Provider Service Identifier(PSID). The PSID may also be referred to as a provider service ID. Andthe SPSID may also be referred to as a sub-provider service ID.

The present invention provides a method for transmitting a serviceannouncement message in a packet format such that a service wanted by ahigher layer entity may be provided in a plurality of communicationmethods.

The present invention provides a compression method for decreasingoverhead of a packet and displaying it in a header. The presentinvention provides a method for transmitting and receiving triggeringinformation of a service wanted by a higher layer entity. The presentinvention supports a method for supporting non-real time messageexchange in the current service providing method that considers realtime only. The present invention provides a method for indicatingnon-real time messaging scheme for non-real time message exchange.

The present invention provides an encapsulation method that may forwarda message or data that may receive and filter the service provided by ahigher layer entity efficiently to a physical layer in a connectedvehicle system.

FIG. 1 illustrates a protocol stack of a connected vehicle systemaccording to an embodiment of the present invention.

Application layer: The application layer may implement and supportvarious use cases. For example, an application may provide road safety,efficient traffic information, and other application information.

Facilities layer: The facility layer may support various use-casesdefined in the application layer so as to effectively implement varioususe-cases. For example, the facility layer may perform applicationsupport, information support, and session/communication support.

Networking & Transport layer: The network/transport layer may configurea network for vehicle communication between homogeneous/heterogeneousnetworks by using various transport protocols and network protocols. Forexample, the networking/transport layer may provide Internet connectionand routing using an Internet protocol such as TCP/UDP+IPv6 or the like.Alternatively, the networking/transport layer may configure a vehiclenetwork by using a geographical position-based protocol such as a basictransport protocol (BTP)/GeoNetworking.

Access layer: The access layer may transmit messages/data received bythe upper layer through a physical channel. For example, the accesslayer may perform/support data communication based on IEEE 802.11 and/or802.11p standard-based communication technology, ITS-G5 wirelesscommunication technology based on physical transmission technology ofthe IEEE 802.11 and/or 802.11p standards, 2G/3G/4G (LTE)/5G wirelesscellular communication technology including satellite/broadband wirelessmobile communication, broadband terrestrial digital broadcastingtechnology such as DVB-T/T2/ATSC, GPS technology, IEEE 1609 WAVEtechnology, and the like.

In FIG. 1, the present invention proposes a networking and transportlayer structure and proposes a method for receiving informationforwarded from a higher layer entity and forwarding it to the accesslayer in ITS network protocol packet format like WSMP. In addition, thepresent invention proposes a method for forwarding a serviceadvertisement which is required for an operation of the access layer.Furthermore, in the case that a transmission of a new packet type isconsidered in a higher layer entity, the present invention proposes amethod for forwarding it to the access layer. Based on the proposedmethod, a service provider may transmit service advertisementinformation efficiently to a user.

In FIG. 1, a higher layer including the facility layer is not dealt inIEEE 1609 standard, and Society of Automotive Engineers (SAE) defines aplurality of use cases, message sets and requirements in the applicationlayer. In the embodiment of FIG. 1, the present invention describes anoperation of the networking/transport layer in more detail below. InFIG. 1, the ITS networking may also correspond to the WSMP for America.The networking/transport layer may receive and format data and messageand forward it to the access layer. The networking/transport layer mayforward non-secured, signed and encrypted information according to atype of message or data. If the message or data is not non-securedmessage/data, the message or data passes through a security layer andmay be controlled and processed by a management layer for communication.

FIG. 2 illustrates a communication between V2X communication apparatusesaccording to an embodiment of the present invention.

In the connected vehicle system, the V2X communication apparatuses likea vehicle and an infrastructure may include the device configurationshown in FIG. 2. The V2X communication apparatuses may communicate witheach other for V2X communication by using the system protocol shown inFIG. 1.

In FIG. 2, the description for the configuration included in the V2Xcommunication apparatus like a vehicle is as below. The V2Xcommunication apparatus of FIG. 2 may include a plurality of antennasystems, and the antenna system configuration may be integrated orprovided separately, or a combination of a part thereof.

Global Navigation Satellite Systems (GNSS) system: A satellitepositioning system for computing a position, an altitude and a velocityof an object moving around the globe using a radio wave emitted from anartificial satellite. This may correspond to an antenna or the subsystem for identifying position information of a vehicle, included inthe V2X communication apparatus of the vehicle.

Dedicated Short Range Communication (DSRC) Radio sub system: An antennaor the sub system for transmission/reception according to DSRC protocol.

Cellular Sub System: An antenna or the sub system for cellular datacommunication.

Broadcasting sub System: An antenna or the sub system fortransmission/reception of broadcast data.

On Board Equipment (OBE) control process Electronic Control Unit (ECU):The OBE control process ECU may be abbreviated to a controller or aprocessor. The controller may process a data message received from aplurality of heterosystems and perform an appropriate operation bycontrolling other ECUs in the vehicle. The controller may execute anapplication for such a data processing and controlling/driving avehicle. In addition, the controller may process sensing data receivedfrom other ECUs in the vehicle and transmit it to external V2Xcommunication apparatuses/vehicles. As an embodiment, all types ofinformation in the vehicle may be transformed into a sharablestandardized format through the controller. As shown in FIG. 2, a SafetyApplication may be executed and transmit and may transmit and receivebus and information in the vehicle such as CAN, Ethernet, and the likein the vehicle. Further, the information may be provided with a userthrough a Driver Vehicle Interface (DVI) such as an audio and a displayof the vehicle.

The V2X communication apparatus configured as such may communicate withan infrastructure, a pedestrian and a supporting system such asCloud/Server as well as the other vehicle.

A Road Side Equipment (RSE) may receive information of a TrafficController and communicate with a vehicle. The RSE may be a fixed deviceand operate as a provider with being connected to a Backend. However,according to an embodiment, since the RSE may collect information from avehicle and transmit it again, the RSE may operate as a user device aswell as the provider device.

FIG. 3 illustrates a V2X communication method according to an embodimentof the present invention.

In FIG. 3, FIG. 3(a) shows a V2X communication of data distributiontype, and FIG. 3(b) shows a V2X communication of application-service IDforwarding type.

In FIG. 3(a), V2X communication apparatuses may transmit/receive data ina unit of application class, and this may be referred to as a datadistribution type communication. In FIG. 3(b), V2X communicationapparatuses may transmit/receive data centering on anapplication-service ID, and this may be referred to as anapplication-service ID centric communication.

In FIG. 3(a), the V2X communication apparatus that receives data maydetermine a necessary application for data filtered primarily using aPSID and execute the corresponding application. In FIG. 3(b), the V2Xcommunication apparatus that receives data may execute a necessaryservice or application immediately by using an application ID.

The present invention proposes a data format and a protocolconfiguration scheme of the networking/transport layer for supportingboth communications of the data distribution type and theapplication-service ID forwarding type.

FIG. 4 illustrates a V2X communication method of a V2X apparatusaccording to an embodiment of the present invention.

In FIG. 4, V2X apparatuses are represented as an RSU and an OBU,respectively, but the V2X apparatuses are not limited thereto.

An RSU 4010 may transmit a message that announces a service such as WAVEService Advertisement (WSA). An OBU 4020 may monitor a channel andreceive the WSA through the monitored channel. The WSA may includechannel information in which a service is provided. The OBU may move toa channel indicated by the received WSA and execute data exchange. Thedata may be communicated with WAVE Short Message Protocol (WSMP) orInternet Protocol (IP). The channel through which the WSA is receive maybe referred to as a control channel, and the channel through which theservice is provided may be referred to as a service channel. The WSAcorresponds to an embodiment of the service advertisement informationdescribed above.

FIG. 5 illustrates a V2X communication method of a V2X apparatusaccording to another embodiment of the present invention.

In FIG. 4, V2X apparatuses are represented as an RSU and an OBU,respectively, but the V2X apparatuses are not limited thereto.

An RSU 5010 may transmit a message that announces a service such as aService Advertisement Message (SAM). An OBU 5020 may monitor a channeland receive the SAM through the monitored channel. The OBU 5020 maytransmit a Service Response Message (SRM). The SAM may include channelinformation in which a service is provided. The OBU may move to achannel indicated by the received WSA and execute data exchange. Thedata may be communicated with WAVE Short Message Protocol (WSMP) orInternet Protocol (IP). The SAM corresponds to an embodiment of theservice advertisement information described above. Detailed descriptionfor the SAM is described below.

As an embodiment, the SRM may include the following fields.

Version: Version is a 4-bit non-signed integer and indicates a versionof service advertisement protocol.

Option selector: Option selector is 4-bit field and indicates whether anoption field is present. According to a field value, the option selectormay indicate whether at least one of SRM extensions field, privatechannel allocation request field, context information field or privatechannel allocation confirm field is present.

A header of the SRM may include the version field and the optionselector. A body of the SRM may include at least one of SRM extensionsfield, private channel allocation request field, context informationfield or private channel allocation confirm field.

FIG. 6 illustrates a V2X communication method of a V2X communicationapparatus according to another embodiment of the present invention.

As described with referring to FIG. 3(a), it is determined by a userdevice on which application/service is executed for the datacommunicated by the provider device and the user device. The module thatdetermines an application/service to be executed by analyzing thereceived data may be called a Service Detection Module (SDM). In thepresent invention, the SDM may correspond to the networking/transportlayer. A processor of the V2X communication apparatus according to anembodiment of the present invention may further include a servicedetection module.

In the structure shown in FIG. 6, a message type may be set for aservice advertisement. In other words, a provider service type is set,and this may be transmitted. As an embodiment, PSType field of 2-bit maybe included in the service advertisement/announcement message.

As an embodiment, the PSType field may represent a data distributiontype when the field value is 00 and represent an application-service IDcentric type when the field value is 01.

FIG. 7 illustrates a format of WAVE Service Advertisement (WSA)information according to an embodiment of the present invention.

The WSA information may include a header and a payload (or body). Theheader of the WSA information may include at least one of WSA versionfield, WSA Header Option Indicator field, WSA Identifier field, contentcount field or WAVE information element extension field. The payload ofthe WSA information may include at least one of Service Info Segment,Channel Info Segment or WAVE Routing Advert field. The description foreach field/segment included in the WAS is as follows.

WSA version: WSA version indicates the version of WAS, when the WSAhaving a WSA version which is not supported, a V2X apparatus may notprocess the WSA.

WSA Header Option Indicator: This field is 4-bit, and indicates apresence of Wave Information Element Extension, Service Info Segment,Channel Info Segment and Wave Routing Advertisement with I/O,respectively.

WSA Identifier: This field may have a value between 0 to 15 and used foridentifying a unique WSA.

Content Count: This field may have a value between 0 to 15 and used fordetermining whether the WSA is a repetition of the previous WSA havingthe same WSA Identifier at a receiver.

Wave Information Element Extension: This field may be used for includingan additional field for the WSA in the WSA. A field such as Repeat Rate,2DLocation, 3DLocation, Advertiser Identifier, and the like may beincluded in the WSA as the Wave Information Element Extension field.

Service Info Segment: This segment provides information for a serviceprovided by an apparatus that transmits the WSA. The Service InfoSegment will be described in more detail below.

Channel Info Segment: This segment provides information for a channelused by an application-service provided by an apparatus that transmitsthe WSA. The Channel Info Segment will be described in more detailbelow.

Wave Routing Advertisement (WRA): This field provides information for aninfrastructure internetwork connectivity such that a receiving apparatusparticipates in IPv6 network which is advertised.

FIG. 8 illustrates a service information segment of WAVE ServiceAdvertisement (WSA) according to an embodiment of the present invention.

In FIG. 8, the service information segment according to an embodiment ofthe present invention further includes a SPSID field. That is, inaddition to the PSID that identifies a provider service or anapplication class, the SPSID field that identifies anapplication-service is added, which enables a transceiver to operate ina unit of application-service.

FIG. 8(a) shows an embodiment of an application class centric datadistribution type, when a value of the service counter field is 0. FIG.8(b) shows an embodiment of including the PSType field described above.The description for the fields/information included in FIG. 8 is asbelow.

Service Info Count: This field indicates the number of instancesincluded in the service information segment.

PSID: This field is an identifier of an application area. The PSID maybe a unique value globally. The PSID may identify an application class.

Service Count: The Service Count field may indicate the number ofapplication services identified by the SPSID.

SPSID: The Sub-PSID field may identify an application-service includedin the corresponding PSID. Different from the PSID value, which is aunique value globally, the SPSID may be a unique value in thecorresponding PSID. A combination of the SPSID and the PSID may be aunique value globally together and may identify allapplication-services.

Channel Index: The Channel Index field provides a pointer for n^(th) setof a channel parameter in the channel information segment in the WSA.The Channel Index field may indicate a service channel through which arelated application-service opportunity is provided.

Service Info Option Indicator: The Service Info Option Indicator fieldmay indicate whether Service Info WAVE information Element Extensionfield is existed.

Service Info WAVE information Element Extension: This field is anadditional element field which may be optionally included in the serviceinformation segment.

PSType: This field may represent a data distribution type when thisfield value is 00 and represent an application-service ID centric typewhen this field is 01.

In FIG. 8(a), a data distribution type is represented when a value ofservice count field is 0, and an application-service ID centric type isrepresented when a value of service count field is 1 or more.

FIG. 9 illustrates a channel information segment of WAVE ServiceAdvertisement (WSA) according to an embodiment of the present invention.

The channel information segment provides information for a channel usedby an application-service which is provided by a device that transmitsthe WSA. The description for the fields included in the channelinformation segment is as below.

Channel Info Count: This field indicates the number of instances whichare included in the channel information segment.

Operating Class: This field is to identify a specific channel uniquelyin a context of a country by the following channel number.

Channel Number: This field indicates the number of channels in relationto accompanying information.

Transmit Power Level: This field indicates Effective Isotropic RadiatedPower (EIRP).

Adaptable: This field indicate that a data rate field value is aboundary value or a fixed value.

Data Rate: This field indicates a data rate used in a channel.

Channel Info Option Indicator: The Channel Info Option Indicator fieldmay indicate a presence of Channel Info WAVE information ElementExtension field.

Channel Info WAVE information Element Extension: This element is anadditional element field which may be optionally included in the channelinformation segment.

FIG. 10 illustrates a channel information segment of WSA according to anembodiment of the present invention.

FIG. 10 shows an embodiment that uses the structure of FIG. 8(a).

FIG. 10(a) shows a signaling of data-distribution type. That is, amessage is not identified for each service, but identified in a unit ofservice-class by using a PSID only.

FIG. 10(b) to FIG. 10(d) show a signaling of application-service IDcentric type.

In FIG. 10(b), the service information segment identifies a service, andthis service is identified with PSID=0x10 and SPSID=2.

In FIG. 10(c), the service information segment identifies three servicesfor a single PSID (0x10). The three services are identified by PSID=0x10and SPSID=2, PSID=0x10 and SPSID=3, and PSID=0x10 and SPSID=3,respectively. In such a case, since there are two identical servicesidentified by PSID=0x10 and SPSID=3, according to an embodiment, aservice count field value may be 2. That is, the service count fieldvalue may count two services including the service of PSID=0x10 andSPSID=2 and the service of PSID=0x10 and SPSID=3.

In FIG. 10(d), the service information segment identifies services fortwo PSIDs 0x10 and 0)(50. Three services of which SPSID is 2, 3 and 5for PSID 0x10 and two services of which SPSID is 1 and 2 for PSID 0x50may be identified by the service information segment.

The V2X communication apparatus that receives the WSA may receive andprocess service data immediately by identifying a desired service. Inthe embodiment of FIG. 10(c) and FIG. 10(d), the V2X communicationapparatus may receive and consume at least one service among a pluralityof services. Lengths of the service count field and the SPSID field maybe changed according to the number of available application-services.

FIG. 11 illustrates Service Advertisement Message (SAM) format accordingto an embodiment of the present invention.

The SAM of FIG. 11 is another embodiment of the service advertisementinformation that corresponds to the WSA described in FIG. 7 to FIG. 11.The description for the fields corresponding to the WSA may be appliedto each of the fields of the SAM, and the same description is notrepeated.

A header of the SAM includes a Version field, an Option Selector field,a SAM ID field, a SAM count field and a SAM Extension field. Thedescription for the WSA header is applied to the fields of the SAMheader. A body of the SAM may include at least one of a serviceinformation segment, a channel information segment or IPv6 RoutingAdvertisement field.

The description for the fields included in the service informationsegment is as below.

Count N: This field indicates the number of ITS-AIDs.

ITS-AID: This field is ITS-AID (Application Identifier) of a variablelength that indicates an advertised service. This field may correspondto the PSID of the WSA.

SAID (SubAID): This field is a value that identifies a service in an AIDand has a unique value in the AID. This field may correspond to theSPSID of the WSA.

Service Count M: This field indicates the number of SAIDs in ITS-AID.

Channel Index: This field is 5-bit unsigned integer, and the ChannelIndex field may be used as an entry pointer of the channel informationsegment.

Option Selectors: This field is 3-bit field and indicates a presence ofan option field.

Bit 2=‘1’b: This field indicates a presence of “System Service” Field.

Bit 1=‘1’b: This field indicates a presence of “Reply Port Number”Field.

Bit 0=‘1’b: This field indicates a presence of “Service InforExtensions” Field.

The description for the fields included in the channel informationsegment is as below.

Operating Class: IEEE 802.11 Operating Class

Channel Number: IEEE 802.11 Channel Number

Transmit Power level: Transmission power level transmitted in acorresponding channel

Adaptable: This field value (corresponding bit) indicates whether DataRate field value includes a Boundary Value or a Fixed Value.

Option Selectors: A bit that enables to select 8 options

-   -   Bit 7˜Bit 1: Future use. Set to ‘0’b    -   Bit 0=‘1’b: This field indicates a presence of “Channel Info        Extensions” Field.

FIG. 12 illustrates a method for transmitting Service SpecificPermission according to an embodiment of the present invention.

The SSP is a service-specific permission and may include anadvertisement permission (AdvertisPermissions) and a providerpermissions (ProviderPermissions). In the case that both theadvertisement permission and the provider permission are not present, adefault permission may be applied. As an embodiment, in the case of theadvertisement permission, if a specific WSA is advertised to anon-permitted channel, the transmitter that sends it may be a target ofmisbehavior report. The default SSP in a certificate of WSA signerindicates that the signer has the default permission.

In the case of the provider permission, PSIDs and channel accessparameters may be transmitted to a specific channel. A combination ofthe PSID and the SPSID may be transmitted in combination of PSID+SSP inthe certificate. However, the present invention proposes a method oftransmitting the SSP by using the WSA.

In embodiment (a) of FIG. 22, SSP information may be included in theservice information segment of the WSA. In embodiment (b) of FIG. 22,SSP information may be included in the optional security field. In thecase of embodiment (b), the security layer may receive the WSA and addthe optional security field thereto, and the optional security field mayinclude the SSP information. The optional security field may furtherinclude at least one of the service information count field thatrepresents the number of PSIDs, the PSID field, the service count fieldthat represents the number of SPSIDs or SPSID field, as described inFIG. 10, in addition to the SSP information.

The SSP may indicate whether a transmission of a transmitter is allowedfor a specific service. A receiver may determine whether to process aspecific message in combination of PSID and SSP. For example, in thecase that the SSP indicates that a transmission is allowed for the SPSIDof a specific PSID, the receiver may process the message. In the casethat the SSP indicates that a transmission is not allowed for the SPSIDof a specific PSID, the receiver may discard or bypass the message, notprocessing the message.

In this embodiment, the receiver may obtain the SSP information withoutusing the security layer/entity. That is, the receiver may obtain theSSP directly, not processing the certificate. Accordingly, the receivermay obtain a transmission permission for a detailed service more rapidlyand improve message filtering and processing speed.

FIG. 13 illustrates a method for indicating a compression according toan embodiment of the present invention.

As the amount of service is subdivided and the service becomesdiversified, the amount of service advertisement information becomesincreased. Accordingly, the present invention proposes a method forsupporting a compression function for a service advertisement andsignaling whether to compress.

FIG. 13(a) shows the WSA format described above.

FIG. 13(b) shows an embodiment that the WSA includes a compression typefield that represents a compression type at the end thereof. The WSAoption indicator may further include an additional bit that representswhether the compression type field is present. This bit may also bereferred to as compression information or compression bit.

FIG. 13(c) shows an embodiment that whether to compress or compressiontype is indicated by using WAVE information element extension field.

As shown in FIG. 13, the service advertisement information may includecompression information that indicates at least one of whether tocompress or compression type of the service advertisement information.As an embodiment, when the compression information is not present, thismay indicate that the service advertisement information is notcompressed.

FIG. 14 illustrates service advertisement information that supportsnon-real time service based on an application class or anapplication-service.

FIG. 14 shows the WAVE Short Message (WSM) format, and the WSM includesthe WSA.

The non-real time service advertisement information for supporting thenon-real time service may include reserved time information as shown inFIG. 14. In addition, the non-real time service advertisementinformation may further include the SPSID information so as to supportthe non-real time service based on the application-service.

The format included in FIG. 14 needs to be reflected on the ManagementInformation Base (MIB) information additionally as shown in FIG. 15 toFIG. 17.

FIG. 15 illustrates additional content of a provider service requesttable for the application-service for the MIB according to an embodimentof the present invention.

FIG. 16 illustrates additional content of a user service request tablefor the application-service for the MIB according to an embodiment ofthe present invention.

FIG. 17 illustrates additional content of a reserved time for non-realtime service to the MIB according to an embodiment of the presentinvention.

FIG. 18 illustrates a method for receiving a hybrid service of a V2Xcommunication apparatus according to an embodiment of the presentinvention.

In FIG. 18, an OBU may be described as a V2X communication apparatus. Inthe embodiment of FIG. 18, the application class/area includesapplication-service A and application-service B.

The OBU may receive the WSA from an RSU provider. The OBU may parse theWSA information and channel-switch it to a service channel of RSUprovider A to perform the application-service A and perform dataexchange through the corresponding channel. The RSU provider A may alsoreceive data using cloud of back-end.

The application-service B may be provided by a Pedestrian Provider.

Particularly, in the case of the application-service B, data exchangemay be performed by using a cellular communication such as 5G. For this,the channel information of the WSA needs to be extended such that othercommunication protocol such as Long-Term Evolution (LTE) 5G may be used.

FIG. 19 illustrates a method for receiving a non-real time service of aV2X communication apparatus according to an embodiment of the presentinvention.

As described in FIG. 14, the WSA information may include a reserved timeinformation for providing a service. Further, based on such a reservedtime, a scheduled WSA may be transmitted from an RS provider to an OBU.The OBU may exchange service data by channel-switching on a reservedtime based on the WSA.

In the provider device and the service communication of a user deviceaccording to the present invention, a receiver may process only theapplication service of a desired application service by receiving it inless count, and accordingly, a service may be provided efficiently. Inaddition, the present invention may support the application class/areathat includes non-real time or hetero application service.

FIG. 20 illustrates a block diagram of a V2X communication apparatusaccording to an embodiment of the present invention.

In FIG. 30, a V2X communication apparatus 20000 may include a memory20010, a processor 20020 and an RF unit 20030. As described above, theV2X communication apparatus may be an On Board Unit (OBU) or a Road SideUnit (RSU), or included in the OBU or the RSU.

The RF unit 20030 may be connected to the processor 20020 andtransmit/receive radio signal. The RF unit 20030 may transmit a signalof the data received from the processor 20020 by upconverting it to thecommunication and reception band.

The processor 20020 may be connected to the RF unit 20030 and implementeach layer according to an ITS system or a WAVE system. The processor20020 may be configured to perform an operation according to variousembodiments of the present invention according to the drawings anddescription described above. In addition, at least one of a module,data, program or software that implements an operation of the V2Xcommunication apparatus 20000 according to various embodiments of thepresent invention described above may be stored in the memory 20010 andexecuted by the processor 20020.

The memory 20010 is connected to the processor 20020 and stores varioustypes of information for executing the processor 20020. The memory 20010may be included interior of the processor 20020 or installed exterior tothe processor 20020 and connected to the processor 20020 via a knownmeans.

The detailed configuration of the V2X communication apparatus 20000 ofFIG. 20 may be implemented such that the various embodiments of thepresent invention described above may be independently applied or two ormore embodiments are applied together. It is described the datareception method according to an embodiment of the present invention ofthe V2X communication apparatus 20000 shown in FIG. 20 below.

FIG. 21 is a flowchart illustrating a data communication method of a V2Xcommunication apparatus according to an embodiment of the presentinvention.

A V2X communication apparatus may receive service advertisementinformation (step, S21010). The V2X communication apparatus may receivethe service advertisement information through a control channel forexchanging system management information or the service advertisementinformation. The service advertisement information announces a service,and the configuration is as described in FIG. 7 to FIG. 14.

The V2X communication apparatus may receive service data (step, S21020).The V2X communication apparatus may receive the service data based onthe received service advertisement information. That is, the V2Xcommunication apparatus may access to the channel through which aservice is provided based on a channel information segment of theservice advertisement information. The service channel is a channel fortransmitting and receiving application-service data for providing theservice.

The service advertisement information announces a service, and theconfiguration is as described in FIG. 7 to FIG. 14.

The service advertisement information may include a header and furtherinclude at least one of the service information segment or the channelinformation segment. The header includes option indicator informationindicating whether at least one of the service information segment orthe channel information segment. The service information segmentprovides information related to a service, and the channel informationsegment provides information related to a channel. The serviceinformation segment includes provider service ID (PSID) informationidentifying an application area/class and sub-provider service ID(SPSID) information identifying a service included in the applicationarea/class.

The service information segment further includes service countinformation representing the number of services identified by the SPSIDinformation. The service advertisement information may further includecompression information indicating at least one of whether to compressthe service advertisement information or a compression type. Inaddition, the service advertisement information may further includereserved time information for non-real time service access. Thereservation time information may indicate a time for non-real timeservice access of a service reception apparatus.

The service advertisement information may further include ServiceSpecific Permission (SSP) information representing whether to allow atransmission for the service. The SSP information may be included in theservice information segment or the optional security field of theservice advertisement information as shown in FIG. 12. The SSPinformation is used together with the PSID information and the SPSIDinformation and provide faster and efficient message filtering.

The V2X communication apparatus may filter desired service data in aunit of service based on the PSID information and the SPSID informationand process the filtered service data, and accordingly, improve aservice providing efficiency.

In the present invention, a service provider may transmit a serviceannouncement for a plurality of SPSIDs in a single PSID. In addition, aservice provider may transmit a service announcement for a requiredservice among a plurality of SPSIDs in association with a PSID. In sucha case, the service announcement information is not transmitted for eachservice, but a plurality of services may be announced with singleservice announcement information, and accordingly, communication burdenmay be decreased. In addition, a service provider may send may compressand send the service announcement, and accordingly, the problem of sizeincrease in transmitting the service announcement for a plurality ofservices may be solved.

A user device may simplify a process for an application serviceprocessing through a detailed service identification. In addition, basedon the present invention, information communicated between a serviceprovider and a user and the filtering thereof may be controlledprecisely, and accordingly, the amount of communication and the servicespeed of the entire V2X communication system may be improved. The userdevice may receive and process only a desired service quickly throughthe precise filtering. Furthermore, a user device may perform anautomatic service filtering in accordance with a situation throughpermission/priority for each application class/area orapplication-service.

Based on the present invention, a service may be reserved for eachapplication class/area or application-service, and the correspondingservice may be provided through a communication channel of differenttype. Triggering information for executing/non-executing a serviceannounced including reserved service may be transmitted. Accordingly, aconditional execution for a reservice service is available. Acommunication type and an addressing scheme according to it may betransmitted so as to perform a service communication through othercommunication channel as well as DSRC channel.

In an embodiment, the V2X communication apparatus corresponds to a userdevice provided with a service. However, the V2X communication apparatusis not limited to the user device. The V2X communication apparatus mayalso correspond to a provider device that provides a service. In thecase that the V2X communication apparatus is a provider, the flowchartof FIG. 20 may be applied as below.

The V2X communication apparatus may transmit the service announcementinformation. In addition, the V2X communication apparatus may alsotransmit service data. The V2X communication apparatus as a providerdevice may perform a communication by accessing to a plurality ofchannels always. That is, in the case of the V2X communication apparatusas a provider, the steps of CCH accessing and SCH accessing are omitted,and the V2X communication apparatus may transmit service data in a SCHwhile transmitting service advertisement information in a CCH.

In the aforementioned embodiments, the elements and characteristics ofthe present invention have been combined in specific forms. Each of theelements or characteristics may be considered to be optional unlessotherwise described explicitly. Each of the elements or characteristicsmay be implemented in a form to be not combined with other elements orcharacteristics. Furthermore, some of the elements and/or thecharacteristics may be combined to form an embodiment of the presentinvention. The sequence of the operations described in the embodimentsof the present invention may be changed. Some of the elements orcharacteristics of an embodiment may be included in another embodimentor may be replaced with corresponding elements or characteristics ofanother embodiment. It is evident that an embodiment may be constructedby combining claims not having an explicit citation relation in theclaims or may be included as a new claim by amendments after filing anapplication.

The embodiment according to the present invention may be implemented byvarious means, for example, hardware, firmware, software or acombination of them. In the case of an implementation by hardware, theembodiment of the present invention may be implemented using one or moreapplication-specific integrated circuits (ASICs), digital signalprocessors (DSPs), digital signal processing devices (DSPDs),programmable logic devices (PLDs), field programmable gate arrays(FPGAs), processors, controllers, microcontrollers, microprocessors, andthe like.

In the case of an implementation by firmware or software, the embodimentof the present invention may be implemented in the form of a module,procedure or function for performing the aforementioned functions oroperations. Software code may be stored in the memory and driven by theprocessor. The memory may be located inside or outside the processor andmay exchange data with the processor through a variety of known means.

It is evident to those skilled in the art that the present invention maybe materialized in other specific forms without departing from theessential characteristics of the present invention. Accordingly, thedetailed description should not be construed as being limitative fromall aspects, but should be construed as being illustrative. The scope ofthe present invention should be determined by reasonable analysis of theattached claims, and all changes within the equivalent range of thepresent invention are included in the scope of the present invention.

MODE FOR INVENTION

It is understood to those skilled in the art that various alterationsand modifications are available in the present invention withoutdeparting from the concept or the scope of the present invention.Accordingly, it is intended that the present invention includesalterations and modifications of the present invention provided in theattached claims and the equivalence thereof.

Both of the device and the method invention are described in the presentdisclosure, and the description of both of the device and the methodinvention may be applied mutually complementarily.

Various embodiments are described in the Best Mode for Invention.

INDUSTRIAL APPLICABILITY

The present invention is used in a series of vehicle communicationfield.

It is understood to those skilled in the art that various alterationsand modifications are available in the present invention withoutdeparting from the concept or the scope of the present invention.Accordingly, it is intended that the present invention includesalterations and modifications of the present invention provided in theattached claims and the equivalence thereof.

1. A method for communicating data of a V2X communication apparatus,comprising: receiving service advertisement information for announcing aservice; and receiving service data based on the service advertisementinformation, wherein the service advertisement information includes atleast one of a header and a service information segment or a channelinformation segment, wherein the header includes option indicatorinformation indicating whether at least one of the service informationsegment or the channel information segment, wherein the serviceinformation segment provides information related to the service, whereinthe channel information segment provides information related to achannel through which the service is provided, and wherein the serviceinformation segment includes provider service ID (PSID) informationidentifying an application area and sub-provider service ID (SPSID)information identifying a service included in the application area. 2.The method for communicating data of claim 1, wherein the serviceinformation segment further includes service count informationrepresenting a number of services identified by the SPSID information.3. The method for communicating data of claim 1, wherein the serviceadvertisement information further includes compression informationindicating at least one of whether to compress the service advertisementinformation or a compression type.
 4. The method for communicating dataof claim 1, wherein the service advertisement information furtherincludes reserved time information for non-real time service access. 5.The method for communicating data of claim 1, further comprising:filtering desired service data based on the PSID information and theSPSID information; and processing the filtered desired service data. 6.The method for communicating data of claim 1, wherein the serviceadvertisement information further includes Service Specific Permission(SSP) information representing whether to allow a transmission for theservice.
 7. A V2X communication apparatus, comprising: a memoryconfigured to store data; an RF unit configured to transmit and receivea radio signal; and a processor configured to control the RF unit,wherein the V2X communication apparatus is configured to: receiveservice advertisement information for announcing a service; and receiveservice data based on the service advertisement information, wherein theservice advertisement information includes at least one of a header anda service information segment or a channel information segment, whereinthe header includes option indicator information indicating whether atleast one of the service information segment or the channel informationsegment, wherein the service information segment provides informationrelated to the service, wherein the channel information segment providesinformation related to a channel through which the service is provided,and wherein the service information segment includes provider service ID(PSID) information identifying an application area and sub-providerservice ID (SPSID) information identifying a service included in theapplication area.
 8. The V2X communication apparatus of claim 7, whereinthe service information segment further includes service countinformation representing a number of services identified by the SPSIDinformation.
 9. The V2X communication apparatus of claim 7, wherein theservice advertisement information further includes compressioninformation indicating at least one of whether to compress the serviceadvertisement information or a compression type.
 10. The V2Xcommunication apparatus of claim 7, wherein the service advertisementinformation further includes reserved time information for non-real timeservice access.
 11. The V2X communication apparatus of claim 7, whereinthe apparatus filters desired service data based on the PSID informationand the SPSID information and processes the filtered desired servicedata.
 12. The V2X communication apparatus of claim 7, wherein theservice advertisement information further includes Service SpecificPermission (SSP) information representing whether to allow atransmission for the service.